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Income Taxes (Summary Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Gross unrecognized tax benefits $ 252.1 $ 206.9 $ 187.6 $ 231.6
Unrecognized tax benefits, net of tax impacts in other jurisdictions 216.1 179.6 160.8  
Interest and penalties related to uncertain tax positions 32.7 19.5 11.0  
Interest and penalties recognized in the consolidated statements of income $ 13.2 $ 8.6 $ (12.5)